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Option Activity under Stock-Based Compensation Plans (Detail) $ / shares in Units, shares in Thousands, $ in Thousands | 9 Months Ended
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Sep. 30, 2018 USD ($) $ / shares shares
Shares Underlying Outstanding Options |
Beginning balance | shares | 3,555
Options granted | shares | 2,386
Options exercised | shares | (40)
Ending balance | shares | 5,683
Vested and expected to vest at September 30, 2018 | shares | 5,422
Exercisable at September 30, 2018 | shares | 2,766
Weighted-Average Exercise Price Per Share |
Beginning balance | $ / shares | $ 19.56
Options granted | $ / shares | 16.56
Options exercised | $ / shares | 11.95
Ending balance | $ / shares | 18.33
Vested and expected to vest at September 30, 2018 | $ / shares | 18.41
Exercisable at September 30, 2018 | $ / shares | $ 20.01
Weighted-Average Remaining Contractual Term (years) |
Balance at September 30, 2018 | 5 years 9 months 3 days
Vested and expected to vest at September 30, 2018 | 5 years 8 months 19 days
Exercisable at September 30, 2018 | 5 years 1 month 20 days
Aggregate Intrinsic Value |
Balance at September 30, 2018 | $ | $ 1,448
Vested and expected to vest at September 30, 2018 | $ | 1,419
Exercisable at September 30, 2018 | $ | $ 927
Unvested |
Shares Underlying Outstanding Options |
Options cancelled | shares | (139)
Weighted-Average Exercise Price Per Share |
Options cancelled | $ / shares | $ 13.89
Vested |
Shares Underlying Outstanding Options |
Options expired | shares | (79)
Weighted-Average Exercise Price Per Share |
Options expired | $ / shares | $ 30.61

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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